The LM2500+G4 is an advanced variant of the LM2500+ aeroderivative gas turbine, designed to provide increased output and thermal efficiency through a set of targeted design upgrades. It retains the core architecture of the LM2500+ but introduces changes to the flow path that increase overall engine performance.

The primary difference between the LM2500+G4 and the LM2500+ is the increased flow capacity in the high-pressure (HP) compressor, HP turbine, and low-pressure turbine. These modifications raise the overall pressure ratio from 23.6 to 24.2, resulting in higher thermal efficiency and greater mass flow. The design changes are relatively limited, focusing mainly on minor geometry adjustments to blades and vanes to accommodate the increased flow.

In the high-pressure turbine, the G4 version includes improved blade cooling and upgraded materials. These changes enable the turbine to handle higher temperatures, contributing to both improved performance and component durability. To maintain proper rotor thrust balance with the updated flow path, the effective area of the compressor discharge pressure seal was also adjusted.

In terms of operational performance, the LM2500+G4 offers measurable improvements over the LM2500+ across a variety of ambient conditions. For example, it delivers approximately 11% more power in cold conditions and 12% more in hot conditions (running data to -50 deg F and start data to –40 deg F). In combined-cycle mode, the G4 variant is expected to provide a power increase of 8.5% and a heat rate improvement of 0.75% compared to the LM2500+.

The LM2500+G4 supports two power turbine configurations:

• A six-stage, low-speed power turbine, typically used for power generation applications with a nominal speed of 3600 rpm.
• A two-stage High-Speed Power Turbine (HSPT), used for mechanical drive applications, designed for a nominal speed of 6100 rpm, with an operating range from 3050 to 6400 rpm.

Both configurations support operation over a cubic load curve, which allows the turbine to match power output with varying mechanical loads — a feature especially useful in pipeline compression and similar variable-load industrial applications.

The LM2500+ DLE gas turbine is designed to provide reliable, efficient while meeting strict environmental rules. Ideal for power plants where emissions limits and water availability are critical concerns, the LM2500+ DLE provides clean, flexible, and high-performance power generation.

Using advanced Dry Low Emissions (DLE) technology, it reduces nitrogen oxide (NOx) and carbon monoxide (CO) emissions without requiring water or steam injection. This makes it especially valuable for facilities aiming to minimize environmental impact and avoid the operational complexity and maintenance costs associated with water-based emissions control systems.

The turbine’s ability to maintain NOx emissions below 25 ppm on natural gas—and as low as 15 ppm under certain conditions—ensures compliance with tough air quality standards.

With a power output exceeding 31 megawatts and thermal efficiency above 40%, the LM2500+ DLE suits a broad range of applications, from utility-scale electricity generation to industrial cogeneration and offshore power. Its fast start capability and robust cycling performance enable it to respond quickly to fluctuating grid demands, making it an excellent partner for integrating renewable energy sources.

Fuel flexibility extends the LM2500+ DLE’s usability across different operational contexts. It runs smoothly on natural gas, diesel, aviation fuels, and even hydrogen blends—offering operators confidence and versatility regardless of fuel availability or market conditions.

Maintenance is simplified thanks to the turbine’s modular design, allowing rapid access and part replacement. This reduces downtime and keeps plants running efficiently, enhancing overall productivity.

Combining power, efficiency, emissions control, and fuel flexibility, the LM2500+ DLE supports effective and compliant power generation in a variety of operational settings.

The Gas Check Valve is a unidirectional valve used in LM2500 gas turbine systems to prevent the reverse flow of combustion gases into critical fuel and oil lines. Its primary function is to maintain the correct flow direction, ensuring that gases only travel toward the combustion chamber and not back into upstream components, where reverse flow could cause damage, safety risks, or system inefficiencies.

This check valve is engineered to operate under the high-pressure and high-temperature conditions typical of industrial gas turbine environments. It serves as a passive safety component, requiring no external power to function, and contributes to the overall reliability and integrity of the turbine system.

Commonly found in aero-derivative gas turbines used in oil and gas applications, the check valve is essential for maintaining proper system performance. Its inclusion in the turbine’s gas path helps ensure safe operation by minimizing the risk of combustion gas contamination in auxiliary systems.

The Blowoff Valve is a 3-inch sleeve-style gas blowoff valve designed for use in aero-derivative industrial gas turbines. Its primary function is to isolate gas fuel during turbine shutdowns or emergency events, helping prevent overspeed conditions and damage caused by uncontrolled combustion.

This valve features a solenoid-pilot actuation system and operates with either 24 VDC or 95–140 VDC electrical input. It is designed with a 3-inch outlet flange and built entirely from stainless steel materials to ensure durability and compliance with NACE standards for sour gas environments.

Performance characteristics include a 110 millisecond full-stroke opening time and 1 second full-stroke closing time, meeting the rapid response requirements necessary for turbine protection. The valve is capable of withstanding heat soak temperatures up to 400°F, allowing it to function reliably in high-temperature turbine enclosures.

For safety in hazardous environments, the blowoff valve is certified to CE-ATEX Group IIA, Category 3, Zone 2, T3, supporting its use in oil and gas facilities with potentially explosive atmospheres.

This valve is often used in redundant pairs to provide dual isolation capability, increasing system reliability. Its application is critical to turbine safety systems, ensuring that fuel flow can be quickly and reliably shut off when required.

LM2500 Fixture, Hinge – Upper Compressor Case is a specialized tool set designed to safely raise and hinge open the upper compressor case of the LM2500 gas turbine engine. This fixture is essential during major maintenance, inspection, or overhaul activities where access to the engine’s internal compressor components is required.

The fixture allows maintenance teams to lift and securely hold the heavy upper compressor case in a hinged, open position. This provides stable and safe access to the compressor rotor and other internal parts, ensuring technicians can carry out detailed inspections or repairs without risking damage to sensitive components.

Made from strong, durable materials, the fixture set is built to support the heavy upper compressor case while keeping everything properly aligned. Its reliable locking and hinge system holds the case securely in place, helping protect the gas turbine.

Compatible with both OEM and MRO procedures, this fixture supports efficient, repeatable maintenance practices and helps reduce overall engine downtime. Whether used in the field or in a dedicated maintenance facility, the LM2500 Hinge Fixture is a critical tool for safe and effective servicing of the LM2500 engine’s compressor section.

The LM2500+ DLE 50Hz Combined Cycle 2x1 system combines two LM2500+ dry low emissions gas turbines, each coupled with a Heat Recovery Steam Generator (HRSG), to power a single steam turbine. This high-efficiency configuration is engineered to meet larger capacity needs, delivering reliable, low-emission power with rapid startup capability.

At the core of this system is the LM2500+, an uprated version of the LM2500, featuring a 17-stage compressor. The addition of a forward-stage blisk increases airflow by approximately 20% at full power. This enhancement boosts the compressor pressure ratio from 18:1 to 23.1:1, contributing to higher overall efficiency and output.

Downstream of the compressor, the engine incorporates a fully annular combustor with externally mounted fuel nozzles, a two-stage air-cooled high-pressure turbine driving the compressor and gearbox, and a six-stage low-pressure power turbine aerodynamically coupled to extract energy from the high-energy exhaust flow. To accommodate the increased output, key design changes were made to the power turbine, including aerodynamic blade optimizations and rotor strengthening.

The Dry Low Emissions (DLE) system plays a crucial role in minimizing environmental impact. Its triple annular combustor lowers flame temperature, reducing NOx and CO emissions without water or steam injection—improving both thermal efficiency and maintainability.

Together, this 2x1 configuration offers a scalable solution for utility and industrial operators seeking clean, efficient, and dependable power generation at higher capacities.

The 3” Gas Fuel Isolation Valve is designed for use in industrial gas turbines within the oil and gas sector, serving as a vital safety and control device. It regulates the flow of natural gas or compressor discharge air to the turbine, enabling quick isolation of fuel supply during abnormal or emergency conditions to protect the turbine from damage.

This valve features a three-inch outlet flange and is solenoid-pilot actuated, operating on 24 or 95-140 VDC power. It is engineered to withstand high-pressure environments, with natural gas operation rated up to 900 psig and compressor air up to 640 psig. It also endures elevated temperatures, tolerating heat soak conditions up to 400°F for natural gas and up to 800°F for compressor air applications.

Constructed from stainless steel materials compliant with NACE standards, the valve resists corrosion in harsh operating conditions typical in oil and gas facilities. It meets strict safety certifications, including CE-ATEX Group IIA, Category 3, Zone 2, T3, making it suitable for use in potentially explosive atmospheres.

The valve operates with a rapid opening time of approximately 110 milliseconds and closes within 1 second, enabling prompt response to operational changes or emergency shutdown signals. Typically installed in pairs to provide dual-redundancy, these valves enhance system safety by ensuring backup isolation capability.

Overall, the 3” Gas Fuel Isolation Valve is essential for maintaining safe, efficient, and reliable turbine operation by controlling and isolating fuel or air flow, thereby preventing damage and reducing the risk of costly downtime in oil and gas power generation applications.